Heat exchange device



Dec. l; 1931. H. v DALGUESH 1,834,604

HEAT EXCHANGE DEVICE Filed Sept. 23, 1950 2 Sheets-Sheet l Deafl, 1931.

H vf DALGLIESH HEAT EXCHANGE DEVICE 1930 2 Sheets-sheet Filed Sept. 25

Patented Dec. 1, 1931 UNITED. STATES PATENT OFFICE HERBERT V'. DALGLIESH, OF ATLANTA, GEORQIA, ASSIG-NOR, BY'MESNE ASSIGNMENTS, v

TO RESEARCH & DEVELOPMENT CORPORATION, OF ATLANTA, GEORGIA, A CORPORA- TION 0F GEORGIA HEAT EXCHANGE :DEVICE Application led September 23, 1930. Serial No. 482,942.

The invention relates to heat exchange devices and aims to provide novel means for heating or cooling fluids by contact with a wall having its exterior in contact with a cooling or heating medium.

t'is an object of the invention to provide a heat exchange device formed of deformed plates spaced apart lby means, of strips spanningr the deformities whereby fluid flowing between the plates and through the passages between said strips may gain access to the inner surfaces of the deformed plates behind the strips thereby vsecuring the substantially full conductivity of the plates and providing turbulence in the streams of fluid by reason of the contact between said streams provide a heat exchange device made up of.

and the fluid in the deformities behind the strips.

It is a further object of the invention lto elements comprising fluid containing flattened passages spaced apart, said elements wedge-shaped 'at their edges whereby gases to be heated or cooled by heat exchange between the same and fluid in the passages may be compressed to some extent as it enters the spaces between the elements and whereby furthermore to provide a strong connection between the/plates making up the elements.

Various additional objects and advantages will become apparent from the following description taken in connection with the accompanying drawings showing illustrative embodiments of the invent-ion and wherelF 1 is an end elevation Fig. 2 is a side elevation, partly broken away;

Fig. 3 is a plan view, also partlybroken away; p

Fig. 4 is a detail sectional view taken on line 4 4 of Fig. 1;

Fig. 5is a diagrammaticelevation of a series parallel arrangement;

Fig. 6 xis a detail perspective view illustrating the interior of the heat 'exchange device;

Figs. 7 and 8 are detail perspective views of modified forms;

Fig. 9 is a vertical sectional view through gated platesy 10, 11, which may be of steel,`

brass, or any other suitable metal, and are shown as specifically formed with angular corrugations although the latter may obviously be curved if desired.

, In order to space said platos 10, 11 apart `and to serve as a connection between the corrugations thereof, a plurality of spaced strips 12 are used.

The strips 12 are as shown applied to one of the plates, as for instance plate 10, with the apices of the interior corrugations of the plate 10 in contact with the strips at `points opposite the interior troughs ofthe plate 11 V.and the plate 11 is thus arranged in contact with such strips 12 4with the apices of the inner Corrugations of the plate 11 in staggered relation to the corrugations of the plate 10. The result of such assembly is that the corrugations of the plates 10 and 11 are in nested relation but spaced apart 'from each other, providing a zigzag path for flow of fluid between the plates. Vith the parts arranged as described, the lines of Contact between the strips `12 and the apices of the corrugations are secured by soldering, brazing, or electric weld# ing.

In view of the presence of the strips 12, the fluid flowing between the plates has access to the inner surfaces of the plates 10, 11, not only between the strips 12 but behind such strips and the fluid flowing between the it flows between the plates and around the strips and the entire body of the fluid to be cooled or heated uniformly as itv emerges from between the plates.

The strips 12 and the inner surfaces of the plates may be first tinned with solderand then the plates and strips pressed together and heated to cause the contacting' portions of the plates with thestrips to adhere by virtue of the solder, thus providing a structure which is inwardly reinforced sufficiently to prevent bulging of the plates, under any reasonable pressure.

The plates 10, 11 and the strips 12 may be made of steel 0r vmetals other than brass` copper, or the like, in which event, instead of the joints being soldered, they may be secured by electric welding, or brazing.

As shown in Fig. 4, the edges of the heattransfer elements are wedge-shaped as at a to lprovide a feather edge to facilitate entrance of 'the air or gaseous medi-um' and to cause the passages between the heat exchange elements to be iared or widest at their edges so that the air will be wedged or constricted as it passes between the heat exchange elements. As further shown in Fig. 4, at the portion a, the plate 11 may overlap the plate 10, be clinched against the same and soldered or welded or in any other way have al leakproof joint-provided.

In the form of the invention shown in Fig. 7, the strips 12 are replaced' by sheets or fabrics of wire mesh material 30. The wires forming such sheets are shown as straight at the portions thereof which engage the apices of the corrugations of the plates 10A and 11. The wire mesh material 30 will cause a thorough mixing of the -iluid flowing through the tortuous passages and will also give substantially the entire radiating surface of the corrugated plates, especially since the iuid, as in the previous form of the invention, must pass behind, around and over the entire surface of the wires or elements forming the material 30.

Y scribed, the plates of a desired extent, that is 4a desired extent longitudinally ofthe corrugations are assembled in such manner as' to cause flow of oil through the different elements in series.

` As shown particularly in Figs. 1 and 6, the elements into which the liquid enters or from which the liquid leaves, being the outside elements in Fig. 1, have the plates forming such elements entered between ope'n edges of a substantially cylindrical header 13 lapping past the outturned opening ih said header to which edges the plates maybe secured as by solder, brazing, electric welding, or the like. To provide a connection between the adjacent ends of ,successive heat exchange ele* ments, the outer plates of a pair of elements are shown as connected to the outturned edges of a header 15 and the inner plates of said pai'r are shown as lapping withland secured to the edges of a channel shaped connecting member 15', thus providing a header at the ends of the connected elements to conduct liquid from one element to the succeeding element in the series, the .next pair of elelnents being likewise connected and the arrangement continued through the number of elements which it is desired to utilize, as for instance, the three pairs as shown.

As an outlet for oil from the final pair of plates of the'series, a pipe 32 is inserted into the outlet header 13, which pipe is provided with a coupling 19. The pipe 32 is shown as slotted at32 with the slot wider at the end remote from the coupling than at the end adjacent thereto. As a result the iiow of oil will be substantially uniform across the Width of the last element from bottom to top thereof.

The ends of the lower headers are shown as provided with clean-out screw plugs In utilizinofthe structure as an oil cooler a casing 0r siell surrounds the same, being of sheet metal and rectangular in form, with 'the ends turned into parallel flanges 22, 23, secured together -as by bolts 24.

Desir-ably anglev members 25 are secured in each corner of the casing21 to space the heat exchange structure from the walls of the casing 21 to permit flow of air therebetween.

To direct air into the space between the plates 10 and 11, casing 21 has its walls formed into a flaring extension as indicated at 26.

In the use of the structure for cooling the lubricating oil used infan internal combustion engine as for instance of an automobile, the device may be supported in any suitable manner as at one side of the motor with the flaring member 26 directed toward the stream of airy from the fan of the cooling water circulating system of the motor and the oil passages of the device are connected into the pipes providing the line of circulation of 'the oil of the motor by means ofcouplings 14 and 19.

Desirably the device is connected in series with the usual oil cleaner, therefore being in a bypass of the main lubricant circulation to the bearing surfaces of the motor; This arrangement is desirable since experiments have shown thatso connected the cooling of the oil will be sufficient with relatively small overall dimensions of the device and because in the bypass the pressure upon the oil will be utilized to provide passage of the large quantity-of oil therethrough without developing too great internal pressures.

It is obvious that the device may be placed as a section of the Water radiator of the automobile, and when so applied may lbe formed with a less number of vertical elements of greater height, if desired.

' secured by a flow of fluid through a path less Referring to the form disclosed in Figs.`

. 9 and l0, upper and lower headers 27 and 28 have the heat exchange elements connected thereto so thatthe passages for the fluid to becooled will be in parallel. In this form of the invention, between the plates 10 'and' 11, perforated metallic plates 34 are shown instead of the strips 12 or Wires 3() and 3l of the preceding fdr-ms. .The apices of the corrugations of plates 10 and 11 are soldered or Welded tothe plates 34.

Said plates 34 are straight and coextensive with the area of plates 10 and 11 and have the perforations or openings 35 thereof arranged in communication with' the tortu-ous passages provided by the plates l and l1. The fluid circulating through the, heat exchange `elements will take a tortuous passage tween the plates and 11 and through the apertures particularly behind and around all portions of plate 34as an aid in securing.,r maximum surface contact with the fluidto accom lish the same ends as mentioned relative to t e preceding forms of the invention,

namely, multiplicities of streams of fluid resultingv and effecting maximum ladmixture and consequently maximum cooling or heating as the case may be. i

-In the arrangement of l, the heat exchange elements are shown all arranged in series so that the luidto be heated or cooled passing bepassesthrough all of the elements in series.

`For some purposes it may be desirable to pass l the fluid through only a portion of the elements in series, a plurality of the series arrangement of the elementsbeing arranged in parallel. Fig. 5 is a diagrammatic showing of such an arrangeme t. l

To ensure that the uid will be delivered to the parallel arranged sets of series, there is shown a feed reservoir 35" having an inlet connection 36 thereto, said reservoir being in turn connected to the inlet end of the .sets of sezriallyv arranged elements 'as by conduits 3 ,38.

The area of the cross-section of conduits 87, 38 is substantially equal to the cross-sectional area of inlet pipe 36;

In the above arrangement a 4common outlet header 39 is shown having an outlet conduit 40 connected thereto. It is obviousthat more than two sets of serially arranged heat lelements may be thus arranged in parallel.

than the entire number of heat exchange elementsor where the arrangement of heat exchange elements in all of a series would .develop too high back pressure in the device. This arrangement may be found of -value where fluid is to be cooledby immer-sing the heat exchange elements in a cooling liquid as water, as for instance in cooling of oil in motor boats or the like.

The device obviously may be used for many different purposes than as an oil cooler as described, and for instance as an automobile radiator, a heat radiator for use in mechanical refrigeration, in the heating of liquids, as a radiator in the heating or cooling of buildings, and in any instance where eflicient heat exchange between liquids and gases 1s desired.

The spacing and heat conducting strips have been shown as separated from each physical embodiment of theinvention within the spirit and scope of -the appended claims Without departing from the spirit of and conductivity of all portions of the fluid the invention.

vI claim:

1 A yheat exchange element comprising in combination spaced deformed plates pro- Viding a tortious passage therebetween, and

means intermediate saidplates, spanning the deformities'thereof and in heat transfer r elation therewith causingv passage of flu1d around and behind said'l'neans as well as in contact with the inner surfaces of 'said plates,

'said plates at their edges being in contacting relation and diverging away from the zone of contact. N

V2. A hea-t exchange element comprlsmg 1n combination spaced deformed plates providing a "tortuous passage therebetween, and

' means intermediate said plates, spanning the deformities thereof and in 'heat transfer relation therewith, causing 'passage of fluid around and behind said means as well as in contact with the inner surfaces of said plates,

ing a tortuous' passage therebetween, and

means intermediate said plates, spanning the deformities thereof andin heat transferrelation therewith, causingh passage of fluid around and behind said means aslwell asxin contact with the inner surfaces of said plates, one of the first mentioned plates at the edges of the element extending beyond and bent around the edge of the remaining plate, and saidplates from said edges diverging from each other to provide a substantially wedgeshaped edge of the element.

HERBERT V. DALGLIESH. 

